यदि f(z) =(7-z)/(1-z^2) जहाँ z = 1+ 2i...

यदि `f(z) =(7-z)/(1-z^2)` जहाँ z = 1+ 2i, तो | f(z)| है :

A

`|z|/2`

B

`|z|`

C

`2|z|`

D

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The correct Answer is:

A

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